Lube-Tech
Exposure to such temperatures initiate the process of polymerization within the oil followed by propagation of polymers. If not terminated by some deliberate action, the propagation continues to full polymerization. Therefore, it is important to reduce exposure to high temperatures and complete the reaction process quickly. Additionally, upon completion of the reaction process anti-oxidants and other additives are needed to help terminate the propagation of polymers. If prepared improperly the biobased grease could continue the polymerizate albeit slowly during storage.
Summary
Biobased lubricants are made with renewable oils and are biodegradable; whereas biodegradable lubricants could be derived from mineral oils that are not biobased. Examples of biobased lubricants are canola oil-based rail curve and wire rope greases that are biobased and biodegradable. An example of biodegradable lubricant would be a PAO-based grease that would pass the biodegradability standards of OECD 301 series tests but is not biobased.
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.118 page 6
In manufacturing biobased lubricants it is important to match the end use requirements with the base oil. Expensive base oils that are often chemically modified versions of vegetable oils are suitable for application where high levels of oxidation stability and sub-zero temperature performances are required. The more economical vegetable oils could be selected based on their fatty acid profiles for different end uses especially the lost-in-use type applications.
Grease manufacturing with vegetable oils require stable oils matching the end use requirements, suitable anti-oxidants, short exposure to high reaction temperatures, terminators to disrupt ensuing propagation of polymers that are initiated due to exposure to high temperatures, and economical pricing.
Today’s biobased base oils fall on a spectrum ranging from the least oxidatively stable and inexpensive oils to high stability vegetable oils that are reasonably priced and to the extreme biobased derived synthetic simple and complex esters that offer stability and cold temperature flowability at 3x-4x higher price than vegetable oils. The end use performance and price dictate which base oil to be used. Ultimately, many of the lost-in-use applications where the lubricants are directly released into the environment will be using biobased products.
References 1.
https://jdparts.deere.com/partsmkt/ document/english/pmac/4968_fb_
HyGardsTransmissionHydraulic.htm
2.
https://parts.cat.com/en/catcorp/bio-hydo-advanced #facet:&productBeginIndex:0&orderBy:&pageView: grid&minPrice:&maxPrice:&pageSize:&currentEndIn dex:0&scrollToProductId:undefined&
3.
www.elmusa.com 4.
www.ultralube.com
LINK
www.elmusa.com
LUBE MAGAZINE NO.147 OCTOBER 2018
39
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